What are the symptoms of tetanus?

Tetanus is a special type of serious disease, mainly due to rust and soil contaminated metal products, scratch or stab the body's skin, so that tetanus bacteria into the body caused by tetanus. Its incubation period is 3-21 days, more than 10 days of onset, typical symptoms of smiling face, angle arch antithesis and body convulsions, etc., mostly due to asphyxia and respiratory failure and lead to death of patients. In order to prevent tetanus, tetanus antitoxin or tetanus immunoglobulin should be injected in time after the above trauma, and the injection time should be controlled within 24 hours.